![]() That puts it in safe boot mode which also runs a file system check. As soon as the Apple appears, let go of the shift key. As soon as you hear it, release the keys and instantly press and hold shift. When you’ve heard enough chimes, wait for one more. The screen usually lights and goes dark again between chimes. It could take a minute or so, depending on the machine. Keep those keys down until you hear the startup chime at least 3 times. You may need both hands on the keyboard until you¹ve done it closer to as many times as I have. Press the power button to start the computer and immediately hold down all of the following 4 keys as quickly as you can: command, option, P, and R (the maneuver used to be called "resetting parameter ram", hence the p and r). To try it, be sure the computer is completely shut down, then disconnect everything from the computer except power cable. The technical name for that maneuver is "resetting the NVRAM". This much came from Apple's SMC reset insructions for you model. Note: The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC. Press the power button to turn on the computer. Release all the keys and the power button at the same time. On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time. Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
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